This article uses a high purity magnesia shaft furnace with an annual output of 54 000 t of a company as a research object.The energy and exergy analysis is carried out based on the operational data of field test.The effective thermal efficiency,general exergy efficiency and destination exergy effi-ciency of the high purity magnesia shaft furnace are calculated,and the results are 6.65%,52.45%and2.37%,respectively.At the same time,the main causes of energy loss caused by the quantity and quality are analyzed,and targeted energy-saving measures are proposed.